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/* Copyright (C) 2003-2025 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library. If not, see
<https://www.gnu.org/licenses/>. */
#include <stdint.h>
#define __HAVE_64B_ATOMICS 1
#define USE_ATOMIC_COMPILER_BUILTINS 0
/* XXX Is this actually correct? */
#define ATOMIC_EXCHANGE_USES_CAS 1
#define __MB " mb\n"
/* Compare and exchange. For all of the "xxx" routines, we expect a
"__prev" and a "__cmp" variable to be provided by the enclosing scope,
in which values are returned. */
#define __arch_compare_and_exchange_xxx_8_int(mem, new, old, mb1, mb2) \
({ \
unsigned long __tmp, __snew, __addr64; \
__asm__ __volatile__ ( \
mb1 \
" andnot %[__addr8],7,%[__addr64]\n" \
" insbl %[__new],%[__addr8],%[__snew]\n" \
"1: ldq_l %[__tmp],0(%[__addr64])\n" \
" extbl %[__tmp],%[__addr8],%[__prev]\n" \
" cmpeq %[__prev],%[__old],%[__cmp]\n" \
" beq %[__cmp],2f\n" \
" mskbl %[__tmp],%[__addr8],%[__tmp]\n" \
" or %[__snew],%[__tmp],%[__tmp]\n" \
" stq_c %[__tmp],0(%[__addr64])\n" \
" beq %[__tmp],1b\n" \
mb2 \
"2:" \
: [__prev] "=&r" (__prev), \
[__snew] "=&r" (__snew), \
[__tmp] "=&r" (__tmp), \
[__cmp] "=&r" (__cmp), \
[__addr64] "=&r" (__addr64) \
: [__addr8] "r" (mem), \
[__old] "Ir" ((uint64_t)(uint8_t)(uint64_t)(old)), \
[__new] "r" (new) \
: "memory"); \
})
#define __arch_compare_and_exchange_xxx_16_int(mem, new, old, mb1, mb2) \
({ \
unsigned long __tmp, __snew, __addr64; \
__asm__ __volatile__ ( \
mb1 \
" andnot %[__addr16],7,%[__addr64]\n" \
" inswl %[__new],%[__addr16],%[__snew]\n" \
"1: ldq_l %[__tmp],0(%[__addr64])\n" \
" extwl %[__tmp],%[__addr16],%[__prev]\n" \
" cmpeq %[__prev],%[__old],%[__cmp]\n" \
" beq %[__cmp],2f\n" \
" mskwl %[__tmp],%[__addr16],%[__tmp]\n" \
" or %[__snew],%[__tmp],%[__tmp]\n" \
" stq_c %[__tmp],0(%[__addr64])\n" \
" beq %[__tmp],1b\n" \
mb2 \
"2:" \
: [__prev] "=&r" (__prev), \
[__snew] "=&r" (__snew), \
[__tmp] "=&r" (__tmp), \
[__cmp] "=&r" (__cmp), \
[__addr64] "=&r" (__addr64) \
: [__addr16] "r" (mem), \
[__old] "Ir" ((uint64_t)(uint16_t)(uint64_t)(old)), \
[__new] "r" (new) \
: "memory"); \
})
#define __arch_compare_and_exchange_xxx_32_int(mem, new, old, mb1, mb2) \
({ \
__asm__ __volatile__ ( \
mb1 \
"1: ldl_l %[__prev],%[__mem]\n" \
" cmpeq %[__prev],%[__old],%[__cmp]\n" \
" beq %[__cmp],2f\n" \
" mov %[__new],%[__cmp]\n" \
" stl_c %[__cmp],%[__mem]\n" \
" beq %[__cmp],1b\n" \
mb2 \
"2:" \
: [__prev] "=&r" (__prev), \
[__cmp] "=&r" (__cmp) \
: [__mem] "m" (*(mem)), \
[__old] "Ir" ((uint64_t)(int32_t)(uint64_t)(old)), \
[__new] "Ir" (new) \
: "memory"); \
})
#define __arch_compare_and_exchange_xxx_64_int(mem, new, old, mb1, mb2) \
({ \
__asm__ __volatile__ ( \
mb1 \
"1: ldq_l %[__prev],%[__mem]\n" \
" cmpeq %[__prev],%[__old],%[__cmp]\n" \
" beq %[__cmp],2f\n" \
" mov %[__new],%[__cmp]\n" \
" stq_c %[__cmp],%[__mem]\n" \
" beq %[__cmp],1b\n" \
mb2 \
"2:" \
: [__prev] "=&r" (__prev), \
[__cmp] "=&r" (__cmp) \
: [__mem] "m" (*(mem)), \
[__old] "Ir" ((uint64_t)(old)), \
[__new] "Ir" (new) \
: "memory"); \
})
/* For all "bool" routines, we return FALSE if exchange successful. */
#define __arch_compare_and_exchange_bool_8_int(mem, new, old, mb1, mb2) \
({ unsigned long __prev; int __cmp; \
__arch_compare_and_exchange_xxx_8_int(mem, new, old, mb1, mb2); \
!__cmp; })
#define __arch_compare_and_exchange_bool_16_int(mem, new, old, mb1, mb2) \
({ unsigned long __prev; int __cmp; \
__arch_compare_and_exchange_xxx_16_int(mem, new, old, mb1, mb2); \
!__cmp; })
#define __arch_compare_and_exchange_bool_32_int(mem, new, old, mb1, mb2) \
({ unsigned long __prev; int __cmp; \
__arch_compare_and_exchange_xxx_32_int(mem, new, old, mb1, mb2); \
!__cmp; })
#define __arch_compare_and_exchange_bool_64_int(mem, new, old, mb1, mb2) \
({ unsigned long __prev; int __cmp; \
__arch_compare_and_exchange_xxx_64_int(mem, new, old, mb1, mb2); \
!__cmp; })
/* For all "val" routines, return the old value whether exchange
successful or not. */
#define __arch_compare_and_exchange_val_8_int(mem, new, old, mb1, mb2) \
({ unsigned long __prev; int __cmp; \
__arch_compare_and_exchange_xxx_8_int(mem, new, old, mb1, mb2); \
(typeof (*mem))__prev; })
#define __arch_compare_and_exchange_val_16_int(mem, new, old, mb1, mb2) \
({ unsigned long __prev; int __cmp; \
__arch_compare_and_exchange_xxx_16_int(mem, new, old, mb1, mb2); \
(typeof (*mem))__prev; })
#define __arch_compare_and_exchange_val_32_int(mem, new, old, mb1, mb2) \
({ unsigned long __prev; int __cmp; \
__arch_compare_and_exchange_xxx_32_int(mem, new, old, mb1, mb2); \
(typeof (*mem))__prev; })
#define __arch_compare_and_exchange_val_64_int(mem, new, old, mb1, mb2) \
({ unsigned long __prev; int __cmp; \
__arch_compare_and_exchange_xxx_64_int(mem, new, old, mb1, mb2); \
(typeof (*mem))__prev; })
/* Compare and exchange with "acquire" semantics, ie barrier after. */
#define atomic_compare_and_exchange_bool_acq(mem, new, old) \
__atomic_bool_bysize (__arch_compare_and_exchange_bool, int, \
mem, new, old, "", __MB)
#define atomic_compare_and_exchange_val_acq(mem, new, old) \
__atomic_val_bysize (__arch_compare_and_exchange_val, int, \
mem, new, old, "", __MB)
/* Compare and exchange with "release" semantics, ie barrier before. */
#define atomic_compare_and_exchange_val_rel(mem, new, old) \
__atomic_val_bysize (__arch_compare_and_exchange_val, int, \
mem, new, old, __MB, "")
/* Atomically store value and return the previous value. */
#define __arch_exchange_8_int(mem, value, mb1, mb2) \
({ \
unsigned long __tmp, __addr64, __sval; __typeof(*mem) __ret; \
__asm__ __volatile__ ( \
mb1 \
" andnot %[__addr8],7,%[__addr64]\n" \
" insbl %[__value],%[__addr8],%[__sval]\n" \
"1: ldq_l %[__tmp],0(%[__addr64])\n" \
" extbl %[__tmp],%[__addr8],%[__ret]\n" \
" mskbl %[__tmp],%[__addr8],%[__tmp]\n" \
" or %[__sval],%[__tmp],%[__tmp]\n" \
" stq_c %[__tmp],0(%[__addr64])\n" \
" beq %[__tmp],1b\n" \
mb2 \
: [__ret] "=&r" (__ret), \
[__sval] "=&r" (__sval), \
[__tmp] "=&r" (__tmp), \
[__addr64] "=&r" (__addr64) \
: [__addr8] "r" (mem), \
[__value] "r" (value) \
: "memory"); \
__ret; })
#define __arch_exchange_16_int(mem, value, mb1, mb2) \
({ \
unsigned long __tmp, __addr64, __sval; __typeof(*mem) __ret; \
__asm__ __volatile__ ( \
mb1 \
" andnot %[__addr16],7,%[__addr64]\n" \
" inswl %[__value],%[__addr16],%[__sval]\n" \
"1: ldq_l %[__tmp],0(%[__addr64])\n" \
" extwl %[__tmp],%[__addr16],%[__ret]\n" \
" mskwl %[__tmp],%[__addr16],%[__tmp]\n" \
" or %[__sval],%[__tmp],%[__tmp]\n" \
" stq_c %[__tmp],0(%[__addr64])\n" \
" beq %[__tmp],1b\n" \
mb2 \
: [__ret] "=&r" (__ret), \
[__sval] "=&r" (__sval), \
[__tmp] "=&r" (__tmp), \
[__addr64] "=&r" (__addr64) \
: [__addr16] "r" (mem), \
[__value] "r" (value) \
: "memory"); \
__ret; })
#define __arch_exchange_32_int(mem, value, mb1, mb2) \
({ \
signed int __tmp; __typeof(*mem) __ret; \
__asm__ __volatile__ ( \
mb1 \
"1: ldl_l %[__ret],%[__mem]\n" \
" mov %[__val],%[__tmp]\n" \
" stl_c %[__tmp],%[__mem]\n" \
" beq %[__tmp],1b\n" \
mb2 \
: [__ret] "=&r" (__ret), \
[__tmp] "=&r" (__tmp) \
: [__mem] "m" (*(mem)), \
[__val] "Ir" (value) \
: "memory"); \
__ret; })
#define __arch_exchange_64_int(mem, value, mb1, mb2) \
({ \
unsigned long __tmp; __typeof(*mem) __ret; \
__asm__ __volatile__ ( \
mb1 \
"1: ldq_l %[__ret],%[__mem]\n" \
" mov %[__val],%[__tmp]\n" \
" stq_c %[__tmp],%[__mem]\n" \
" beq %[__tmp],1b\n" \
mb2 \
: [__ret] "=&r" (__ret), \
[__tmp] "=&r" (__tmp) \
: [__mem] "m" (*(mem)), \
[__val] "Ir" (value) \
: "memory"); \
__ret; })
#define atomic_exchange_acq(mem, value) \
__atomic_val_bysize (__arch_exchange, int, mem, value, "", __MB)
#define atomic_exchange_rel(mem, value) \
__atomic_val_bysize (__arch_exchange, int, mem, value, __MB, "")
/* Atomically add value and return the previous (unincremented) value. */
#define __arch_exchange_and_add_8_int(mem, value, mb1, mb2) \
({ __builtin_trap (); 0; })
#define __arch_exchange_and_add_16_int(mem, value, mb1, mb2) \
({ __builtin_trap (); 0; })
#define __arch_exchange_and_add_32_int(mem, value, mb1, mb2) \
({ \
signed int __tmp; __typeof(*mem) __ret; \
__asm__ __volatile__ ( \
mb1 \
"1: ldl_l %[__ret],%[__mem]\n" \
" addl %[__ret],%[__val],%[__tmp]\n" \
" stl_c %[__tmp],%[__mem]\n" \
" beq %[__tmp],1b\n" \
mb2 \
: [__ret] "=&r" (__ret), \
[__tmp] "=&r" (__tmp) \
: [__mem] "m" (*(mem)), \
[__val] "Ir" ((signed int)(value)) \
: "memory"); \
__ret; })
#define __arch_exchange_and_add_64_int(mem, value, mb1, mb2) \
({ \
unsigned long __tmp; __typeof(*mem) __ret; \
__asm__ __volatile__ ( \
mb1 \
"1: ldq_l %[__ret],%[__mem]\n" \
" addq %[__ret],%[__val],%[__tmp]\n" \
" stq_c %[__tmp],%[__mem]\n" \
" beq %[__tmp],1b\n" \
mb2 \
: [__ret] "=&r" (__ret), \
[__tmp] "=&r" (__tmp) \
: [__mem] "m" (*(mem)), \
[__val] "Ir" ((unsigned long)(value)) \
: "memory"); \
__ret; })
/* ??? Barrier semantics for atomic_exchange_and_add appear to be
undefined. Use full barrier for now, as that's safe. */
#define atomic_exchange_and_add(mem, value) \
__atomic_val_bysize (__arch_exchange_and_add, int, mem, value, __MB, __MB)
/* ??? Blah, I'm lazy. Implement these later. Can do better than the
compare-and-exchange loop provided by generic code.
#define atomic_decrement_if_positive(mem)
#define atomic_bit_test_set(mem, bit)
*/
#define atomic_full_barrier() __asm ("mb" : : : "memory");
#define atomic_read_barrier() __asm ("mb" : : : "memory");
#define atomic_write_barrier() __asm ("wmb" : : : "memory");
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